Online Spreadsheet Cleaner for Excel and CSV
Whatever's in your spreadsheet, Clean That Sheet™ helps you get your sheet together. One upload, one cleanup, one download.
The goal is what comes after the cleanup. Catch issues now so the report, import, submission, or handoff can keep moving.
Whatever needs to happen next, messy spreadsheet data should not be the reason it stalls. Upload once and preview what CTS would clean before anything changes.
Free preview first. Full cleanup only if it helps.
Upload your file to see an issue summary, duplicate groups, blank rows, sample cleaned rows, and cleanup notes. If the preview looks useful, unlock the full cleaned file and change report for $4.99.
Drag & drop your file or screenshot, or browse
Accepts .xlsx, .xls, .csv, .png, .jpg, and .pdf · up to 50 MB
Tip: upload the actual spreadsheet file, not Excel temporary files that start with ~$.
Free scan + cleaned sample. No charge to preview.
No signup. Original file unchanged. View Trust & File Handling
On mobile, screenshots and CSVs work best. Larger Excel files are easier from desktop.
Not ready to upload? See a Sample Cleanup
Built for
Built for people with something to finish, not a spreadsheet to babysit.
Analysts, bookkeepers, admins, operators, founders, and finance teams use CTS to get files ready for the send, import, merge, report, submission, or handoff that actually matters.
- Analysts
- Bookkeepers
- Admins
- Operators
- Founders
- Finance teams
- Spreadsheet-heavy workflows
You do not need to diagnose the sheet before you can move forward. Upload the Excel or CSV file, review what CTS finds, and unlock only when the result helps you reach the next step.
CTS checks duplicate rows, blanks, spacing, inconsistent formatting, messy headers, dates, imported-data problems, and other things that can get between the file and its destination.
The spreadsheet is one step. Your goal is what comes next.
A finished report, successful import, clean handoff, or client-ready file is the point. Clean That Sheet™ helps with the repeatable cleanup step so you can get there without making spreadsheet repair your whole afternoon.
- Step 1
Bring the file that is in the way
Drop in a spreadsheet, CSV, screenshot, or PDF.
- Step 2
See what needs attention
Preview what CTS would clean before you commit.
- Step 3
Keep the work moving
Get a cleaned copy for whatever needs to happen next.
The cleanup is one step, not the whole job
Preview the actual file, understand the changes, and keep moving.
With a chat tool
With Clean That Sheet™
Explain the problem and write prompts
Upload the file
Clarify what should be cleaned
Preview what CTS would clean
Check whether the output is usable
Download a cleaned copy
Figure out what changed
Get a Change Report
No prompts. No back-and-forth. Get past the cleanup step and back to the import, report, submission, or handoff.
What CTS gets out of your way
Bring the messy real-world file. Leave with something ready for the next person, platform, or decision.
Supported files
- Excel files (.xlsx, .xls)
- CSV exports
- Screenshots (.png, .jpg)
- PDF report tables
Common cleanup outcomes
- Duplicate rows removed or flagged
- Blank rows and empty columns cleared
- Dates and number formats standardized
- Extra spaces and casing cleaned up
- Invalid emails and obvious errors flagged
- Original structure and headers preserved
- Preview flags messy cells before payment.
- Duplicates, blanks, formatting issues, and invalid emails are easier to spot.
- You decide whether the cleanup is worth unlocking.
- Tested on messy exports, contact lists, transaction sheets, and screenshot cleanups.
“We've found this tool to be a great fit for the kind of spreadsheet work we do at Lombard Toyota. It helps turn large, messy data exports into something much easier to read and work with, without requiring a lot of manual cleanup.
What we especially like is that it seems to understand the structure of dealership data instead of treating every column the same. That saves time and makes the finished spreadsheets much more useful for our day-to-day work.
Definitely a helpful tool for an automotive dealership working with a lot of data.”
Lombard Toyota
Google Workspace Marketplace™ Review, August 13, 2026
Spreadsheets are how the world actually runs, customer lists, vendor sheets, inventory, sales pipelines, survey results, recruiting trackers, side project budgets, the data behind every monthly report. And every single one of them gets messy. People type things slightly differently. Exports come in inconsistent formats. Rows get duplicated. Empty rows multiply. By the time you actually need to use the file, it needs an hour of cleanup first.
Clean That Sheet™ is the universal cleanup step. Upload any .csv, .xlsx, or .xls file and we'll handle the predictable mess: duplicate and near duplicate rows, leading and trailing whitespace, inconsistent casing on names and emails, mixed date formats, empty rows, and messy column headers. The output is the same file, just usable.
It's built for non technical users on purpose. There's no formula to write, no macro to debug, no Python script to maintain, no "connect your data warehouse" wizard. You drop in a file, you see a free preview, you pay only if it looks right, and you download a clean version. That's the whole product.
If you clean spreadsheets a few times a month, exporting customer data before a campaign, prepping a vendor list before an import, deduping a survey response file, cleaning up a CRM export before handing it to a teammate, this is the tool we wish existed when we were doing the same thing by hand. Bring your messiest sheet. It'll be fine.
Want cleaner files with less work?
Get occasional updates as Clean That Sheet™ adds more ways to fix messy spreadsheets.
The FAQ
Questions people ask before cleaning a spreadsheet
- How do I clean a spreadsheet before sending it?
- Check duplicates, blank rows, extra spaces, inconsistent dates, unclear headers, and any columns the recipient does not need. Keep the original and review the cleaned copy before sending.
- What does an online spreadsheet cleaner do?
- It automates common cleanup tasks such as removing accidental duplicates and blanks, trimming whitespace, standardizing values, and making spreadsheet data easier to use.
- How do I clean a customer list in Excel?
- Standardize the fields that identify a customer, trim whitespace, review duplicate emails or IDs, remove empty padding rows, and verify required contact fields before using the list.
- How do I clean a vendor list spreadsheet?
- Make vendor names and IDs consistent, remove duplicates, clean contact fields, standardize dates and categories, and confirm bank or sensitive information is handled through the proper secure workflow.
- How do I clean a spreadsheet before building a report?
- Verify the date range, remove duplicate records, normalize key dimensions, check blanks in important fields, and confirm totals against the source before reporting.
- How do I clean a spreadsheet before importing it?
- Use the destination's field requirements first, then standardize headers, trim whitespace, clean dates and IDs, remove accidental blank rows, and review duplicates.
- Can I clean a spreadsheet without macros or scripts?
- Yes. Most everyday cleanup tasks can be handled with built-in spreadsheet tools or a dedicated cleanup workflow without writing VBA, Python, or macros.
- What should I check before handing a spreadsheet to someone else?
- Make sure it is the correct version, key fields are understandable, duplicates and blank padding are handled, formulas still work, and any sensitive information that is not needed has been removed.